From e5bd27b5edf533054513871dc475a54a8b1bee23 Mon Sep 17 00:00:00 2001
From: Mateusz Kowalczyk <fuuzetsu@fuuzetsu.co.uk>
Date: Mon, 24 Feb 2014 22:01:11 +0000
Subject: Change rendering of duplicate record field docs
See Haddock Trac #195. We now change this behaviour to only rendering
the documentation attached to the first instance of a duplicate field.
Perhaps we could improve this by rendering the first instance that has
documentation attached to it but for now, we'll stick with this.
---
src/Haddock/Interface/Create.hs | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
(limited to 'src/Haddock')
diff --git a/src/Haddock/Interface/Create.hs b/src/Haddock/Interface/Create.hs
index cf5a3451..f3658a12 100644
--- a/src/Haddock/Interface/Create.hs
+++ b/src/Haddock/Interface/Create.hs
@@ -31,6 +31,7 @@ import Data.Ord
import Control.Applicative
import Control.DeepSeq
import Control.Monad
+import Data.Function (on)
import qualified Data.Foldable as F
import qualified Data.Traversable as T
@@ -255,7 +256,7 @@ mkMaps :: DynFlags
-> ErrMsgM Maps
mkMaps dflags gre instances decls = do
(a, b, c, d) <- unzip4 <$> mapM mappings decls
- return (f a, f b, f c, f d, instanceMap)
+ return (f $ map (nubBy ((==) `on` fst)) a , f b, f c, f d, instanceMap)
where
f :: (Ord a, Monoid b) => [[(a, b)]] -> Map a b
f = M.fromListWith (<>) . concat
--
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